/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.tomcat.util.digester;

import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.xml.sax.SAXException;
import org.xml.sax.SAXNotRecognizedException;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import java.util.Properties;

/**
 * Create a <code>SAXParser</code> configured to support XML Schema and DTD.
 *
 * @since 1.6
 */

public class GenericParser {

	/**
	 * The Log to which all SAX event related logging calls will be made.
	 */
	private static final Log log =
			LogFactory.getLog("org.apache.tomcat.util.digester.Digester.sax");

	/**
	 * The JAXP 1.2 property required to set up the schema location.
	 */
	private static final String JAXP_SCHEMA_SOURCE =
			"http://java.sun.com/xml/jaxp/properties/schemaSource";

	/**
	 * The JAXP 1.2 property to set up the schemaLanguage used.
	 */
	protected static String JAXP_SCHEMA_LANGUAGE =
			"http://java.sun.com/xml/jaxp/properties/schemaLanguage";

	/**
	 * Create a <code>SAXParser</code> configured to support XML Schema and DTD
	 *
	 * @param properties parser specific properties/features
	 * @return an XML Schema/DTD enabled <code>SAXParser</code>
	 */
	public static SAXParser newSAXParser(Properties properties)
			throws ParserConfigurationException,
			SAXException,
			SAXNotRecognizedException {

		SAXParserFactory factory =
				(SAXParserFactory) properties.get("SAXParserFactory");
		SAXParser parser = factory.newSAXParser();
		String schemaLocation = (String) properties.get("schemaLocation");
		String schemaLanguage = (String) properties.get("schemaLanguage");

		try {
			if (schemaLocation != null) {
				parser.setProperty(JAXP_SCHEMA_LANGUAGE, schemaLanguage);
				parser.setProperty(JAXP_SCHEMA_SOURCE, schemaLocation);
			}
		} catch (SAXNotRecognizedException e) {
			log.info(parser.getClass().getName() + ": "
					+ e.getMessage() + " not supported.");
		}
		return parser;
	}

}